Provide a build option to use [Esc] instead of [F2] for devices such as Chromebooks that don't have F-keys. Cc: Guo Dong <guo.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Maurice Ma <maurice.ma@intel.com> Cc: Benjamin You <benjamin.you@intel.com> Signed-off-by: Sean Rhodes <sean@starlabs.systems> Reviewed-by: Ray Ni <ray.ni@Intel.com> Reviewed-by: Guo Dong <guo.dong@intel.com>